Mr Banki
Without case details it is difficult to advise with concrete suggestion.
Prima facie it appears wrong that you went for CBI enquiry.
You should have rather applied for Writ against police inaction which case the court would have asked for institution of SIT.
CBI enquiry is not allowed unless large scale offence spanning several states is involved.
The orders of the court if any and the writ petition needs to be seen for further advice.
Best of luck.